package com.example.community.entity;

/**
 * 封装分页相关的信息
 */
public class Page {
    //当前页码
    private int current = 1;
    //显示上限
    private int limit = 10;
    // 数据的总页数
    private int rows;
    //查询路径, 用于复用分页链接
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current >= 1){
            this.current = current;
        }
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if(limit >= 1 && limit <= 100){
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        this.rows = rows;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    //获取当前页的起始行
    public int getOffset(){
        return (current - 1) * limit;
    }
    //获取总的页数, 注意整除的情况
    public int getTotal(){
        return rows % limit == 0 ? rows / limit : rows / limit + 1;
    }
    //获取起始页码, 左侧边界需要大于1
    public int getFrom(){
        return current - 2 > 0? current - 2: 1;
    }
    //获取结束页码
    public int getTo(){
        return Math.min(current + 2, getTotal());
    }
}
